Name
pcap_lookupdev — Prototype: char *pcap_lookupdev(char *errbuf)
Synopsis
Purpose: pcap_lookupdev finds the first usable
interface (active and supported by libpcap) for
use with pcap_open_live and
pcap_lookup_net returned by the operating system.
The function returns a string containing the
device’s name if successful. If not successful, the
function returns NULL and
errbuf contains a human-readable error message.
pcap_lookupdev is not recommended in situations
where multiple network interfaces are in use. Note that if the
calling user does not have appropriate privileges, this function
might not return a device even though usable devices are present. You
can find an example of using pcap_lookupdev in the
Section 10.2.2
section earlier in this chapter.
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